Ehhttjtjreh fjgmfgky ut6rb

Solution

a t t h e h i g h e s t p o i n t o f t h e d e a t h w e l l, t h e m o t o r c y c l i s t, t h e n o r m a l r e a c t i o n R o n t h e m o t o r c y c l i s t b y t h e s i d e s o f t h e c h a m b e r a c t s d o w n w a r d s . T h e w e i g h t o f t h e m o t o r c y c l i s t m g a l s o a c t d o w n w a r d s . h e n c e, R + m g = \frac{m v^{2}}{r} w h e n m i n i m u m s p e e d i s r e q u i r e d t o p e r f o r m a v e r t i c a l l o o p; t h e n R = 0 h e n c e m g = \frac{m {v_{m i n}}^{2}}{r} v_{m i n} = \sqrt{g r} = \sqrt{9.8 \times 40.8} = 19.99 m / s